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62 lines
1.8 KiB
C++
62 lines
1.8 KiB
C++
//===--- HeapObject.h -----------------------------------------------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2015 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See http://swift.org/LICENSE.txt for license information
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// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#ifndef SWIFT_STDLIB_SHIMS_HEAPOBJECT_H
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#define SWIFT_STDLIB_SHIMS_HEAPOBJECT_H
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#include "RefCount.h"
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#ifdef __cplusplus
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#include <type_traits>
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#include "swift/Basic/type_traits.h"
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namespace swift {
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#endif
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struct HeapMetadata;
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// The members of the HeapObject header that are not shared by a
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// standard Objective-C instance
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#define SWIFT_HEAPOBJECT_NON_OBJC_MEMBERS \
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StrongRefCount refCount; \
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WeakRefCount weakRefCount
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/// The Swift heap-object header.
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struct HeapObject {
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/// This is always a valid pointer to a metadata object.
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struct HeapMetadata const *metadata;
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SWIFT_HEAPOBJECT_NON_OBJC_MEMBERS;
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// FIXME: allocate two words of metadata on 32-bit platforms
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#ifdef __cplusplus
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HeapObject() = default;
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// Initialize a HeapObject header as appropriate for a newly-allocated object.
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constexpr HeapObject(HeapMetadata const *newMetadata)
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: metadata(newMetadata)
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, refCount(StrongRefCount::Initialized)
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, weakRefCount(WeakRefCount::Initialized)
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{ }
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#endif
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};
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#ifdef __cplusplus
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static_assert(swift::IsTriviallyConstructible<HeapObject>::value,
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"HeapObject must be trivially initializable");
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static_assert(std::is_trivially_destructible<HeapObject>::value,
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"HeapObject must be trivially destructible");
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}
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#endif
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#endif
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